# frozen_string_literal: true
module Pod::Vendor

  # require "rubygems/version"
  # require "rubygems/deprecate"

  # If we're being loaded after yaml was already required, then
  # load our yaml + workarounds now.
  # Gem.load_yaml if defined? ::YAML

  ##
  # A Requirement is a set of one or more version restrictions. It supports a
  # few (<tt>=, !=, >, <, >=, <=, ~></tt>) different restriction operators.
  #
  # See Gem::Version for a description on how versions and requirements work
  # together in RubyGems.

  class Gem::Requirement
    OPS = { #:nodoc:
      "="  =>  lambda { |v, r| v == r },
      "!=" =>  lambda { |v, r| v != r },
      ">"  =>  lambda { |v, r| v >  r },
      "<"  =>  lambda { |v, r| v <  r },
      ">=" =>  lambda { |v, r| v >= r },
      "<=" =>  lambda { |v, r| v <= r },
      "~>" =>  lambda { |v, r| v >= r && v.release < r.bump }
    }

    SOURCE_SET_REQUIREMENT = Struct.new(:for_lockfile).new "!" # :nodoc:

    quoted  = OPS.keys.map { |k| Regexp.quote k }.join "|"
    PATTERN_RAW = "\\s*(#{quoted})?\\s*(#{Gem::Version::VERSION_PATTERN})\\s*" # :nodoc:

    ##
    # A regular expression that matches a requirement

    PATTERN = /\A#{PATTERN_RAW}\z/

    ##
    # The default requirement matches any version

    DefaultRequirement = [">=", Gem::Version.new(0)]

    ##
    # Raised when a bad requirement is encountered

    class BadRequirementError < ArgumentError; end

    ##
    # Factory method to create a Gem::Requirement object.  Input may be
    # a Version, a String, or nil.  Intended to simplify client code.
    #
    # If the input is "weird", the default version requirement is
    # returned.

    def self.create input
      case input
      when Gem::Requirement then
        input
      when Gem::Version, Array then
        new input
      when '!' then
        source_set
      else
        if input.respond_to? :to_str then
          new [input.to_str]
        else
          default
        end
      end
    end

    ##
    # A default "version requirement" can surely _only_ be '>= 0'.

    def self.default
      new '>= 0'
    end

    ###
    # A source set requirement, used for Gemfiles and lockfiles

    def self.source_set # :nodoc:
      SOURCE_SET_REQUIREMENT
    end

    ##
    # Parse +obj+, returning an <tt>[op, version]</tt> pair. +obj+ can
    # be a String or a Gem::Version.
    #
    # If +obj+ is a String, it can be either a full requirement
    # specification, like <tt>">= 1.2"</tt>, or a simple version number,
    # like <tt>"1.2"</tt>.
    #
    #     parse("> 1.0")                 # => [">", Gem::Version.new("1.0")]
    #     parse("1.0")                   # => ["=", Gem::Version.new("1.0")]
    #     parse(Gem::Version.new("1.0")) # => ["=,  Gem::Version.new("1.0")]

    def self.parse obj
      return ["=", obj] if Gem::Version === obj

      unless PATTERN =~ obj.to_s
        raise BadRequirementError, "Illformed requirement [#{obj.inspect}]"
      end

      if $1 == ">=" && $2 == "0"
        DefaultRequirement
      else
        [$1 || "=", Gem::Version.new($2)]
      end
    end

    ##
    # An array of requirement pairs. The first element of the pair is
    # the op, and the second is the Gem::Version.

    attr_reader :requirements #:nodoc:

    ##
    # Constructs a requirement from +requirements+. Requirements can be
    # Strings, Gem::Versions, or Arrays of those. +nil+ and duplicate
    # requirements are ignored. An empty set of +requirements+ is the
    # same as <tt>">= 0"</tt>.

    def initialize *requirements
      requirements = requirements.flatten
      requirements.compact!
      requirements.uniq!

      if requirements.empty?
        @requirements = [DefaultRequirement]
      else
        @requirements = requirements.map! { |r| self.class.parse r }
      end
    end

    ##
    # Concatenates the +new+ requirements onto this requirement.

    def concat new
      new = new.flatten
      new.compact!
      new.uniq!
      new = new.map { |r| self.class.parse r }

      @requirements.concat new
    end

    ##
    # Formats this requirement for use in a Gem::RequestSet::Lockfile.

    def for_lockfile # :nodoc:
      return if [DefaultRequirement] == @requirements

      list = requirements.sort_by { |_, version|
        version
      }.map { |op, version|
        "#{op} #{version}"
      }.uniq

      " (#{list.join ', '})"
    end

    ##
    # true if this gem has no requirements.

    def none?
      if @requirements.size == 1
        @requirements[0] == DefaultRequirement
      else
        false
      end
    end

    ##
    # true if the requirement is for only an exact version

    def exact?
      return false unless @requirements.size == 1
      @requirements[0][0] == "="
    end

    def as_list # :nodoc:
      requirements.map { |op, version| "#{op} #{version}" }.sort
    end

    def hash # :nodoc:
      requirements.sort.hash
    end

    def marshal_dump # :nodoc:
      fix_syck_default_key_in_requirements

      [@requirements]
    end

    def marshal_load array # :nodoc:
      @requirements = array[0]

      fix_syck_default_key_in_requirements
    end

    def yaml_initialize(tag, vals) # :nodoc:
      vals.each do |ivar, val|
        instance_variable_set "@#{ivar}", val
      end

      Gem.load_yaml
      fix_syck_default_key_in_requirements
    end

    def init_with coder # :nodoc:
      yaml_initialize coder.tag, coder.map
    end

    def to_yaml_properties # :nodoc:
      ["@requirements"]
    end

    def encode_with coder # :nodoc:
      coder.add 'requirements', @requirements
    end

    ##
    # A requirement is a prerelease if any of the versions inside of it
    # are prereleases

    def prerelease?
      requirements.any? { |r| r.last.prerelease? }
    end

    def pretty_print q # :nodoc:
      q.group 1, 'Gem::Requirement.new(', ')' do
        q.pp as_list
      end
    end

    ##
    # True if +version+ satisfies this Requirement.

    def satisfied_by? version
      raise ArgumentError, "Need a Gem::Version: #{version.inspect}" unless
        Gem::Version === version
      # #28965: syck has a bug with unquoted '=' YAML.loading as YAML::DefaultKey
      requirements.all? { |op, rv| (OPS[op] || OPS["="]).call version, rv }
    end

    alias :=== :satisfied_by?
    alias :=~ :satisfied_by?

    ##
    # True if the requirement will not always match the latest version.

    def specific?
      return true if @requirements.length > 1 # GIGO, > 1, > 2 is silly

      not %w[> >=].include? @requirements.first.first # grab the operator
    end

    def to_s # :nodoc:
      as_list.join ", "
    end

    def == other # :nodoc:
      Gem::Requirement === other and to_s == other.to_s
    end

    private

    def fix_syck_default_key_in_requirements # :nodoc:
      Gem.load_yaml

      # Fixup the Syck DefaultKey bug
      @requirements.each do |r|
        if r[0].kind_of? Gem::SyckDefaultKey
          r[0] = "="
        end
      end
    end
  end

  class Gem::Version
    # This is needed for compatibility with older yaml
    # gemspecs.

    Requirement = Gem::Requirement # :nodoc:
  end
end
